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4 Channel Relay HAT Module Board For Raspberry Pi 3B/3B+(Plus)

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                  Description:

                  – 4 Channel Relay Hat Board For Raspberry Pi is one of the "docker pi" module.
                  – It has 4 channel relay that you can put it on your smart home project.
                  – This four-channel relay uses high-quality relay modules combined with the most popular microcontroller technology to communicate with the
                     Raspberry Pi.
                  – You can use multiple modules stacked together for use.
                  – You can stack up to four layers.
                  – Switch the I2C address of the device through the DIP switch on the circuit board to ensure that the four-layer module gets different addresses, thus
                    avoiding the problem of address duplication.
                  – The module is very fast, easy to install, and supports multi-language development, making it ideal for smart home projects.

                  Features:

                  – Easy to use
                  – 4 channel relay
                  – Support I2C protocol
                  – Support for stacking
                  – Support address switching by dial switch
                  – Support multi-language programming
                  – Support 3A 250V AC
                  – Support 3A 30V DC
                  – Support relay status light prompt

                  Click for more info.

                  Note:

                  The 4pin pin is a backup that supplies power to future products. You can ignore those pins. Please do not connect any device to that pins.
                  The price is only for 1pcs of relay
                  The RPI mainboard is not included

                  Package included:

                  1x 4 Channel Relay Hat Board
                  4x M2.5×11+6 copper stick
                  8x M2.5×5 screws & nuts
                  1x Instructions

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